Ethanol → (3r)-3-t-Butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)pyrrolidine

HRID 891578Notes

Reaction equation

HRID 891578 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[N:7]=[C:8]([N:11]2[CH2:15][CH2:14][C@@H:13]([OH:16])[CH2:12]2)[S:9][CH:10]=1)=[O:5])[CH3:2].[Si:17](Cl)([C:30]([CH3:33])([CH3:32])[CH3:31])([C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.N1C=CN=C1.C(O)C>CN(C)C=O>[Si:17]([O:16][C@@H:13]1[CH2:14][CH2:15][N:11]([C:8]2[S:9][CH:10]=[C:6]([C:4]([O:3][CH2:1][CH3:2])=[O:5])[N:7]=2)[CH2:12]1)([C:30]([CH3:33])([CH3:32])[CH3:31])([C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=1)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1

Participants

6

Reactant 4

HCID 702EthanolHCID 795ImidazoleHCID 94078tert-ButyldiphenylchlorosilaneHCID 69544049HCID 69544049, compound

Product 1

HCID 69544224(3r)-3-t-Butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)pyrrolidineYield 98.1%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of (3R)-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)-3-hydroxypyrrolidine (3.0 g, 12.4 mmol) (obtained as described in Reference Example 18(2)) in dimethylformamide (90 ml) were added t-butyldiphenylsilyl chloride (6.45 ml, 24.8 mmol) and imidazole (1.69 g, 24.8 mmol) in an ice bath. After stirring the mixture in an ice bath for 10 minutes, the resulting mixture was stirred at room temperature overnight. After checking the completion of the reaction, ethanol (2.59 ml) was added to the reaction mixture in an ice bath and the resulting mixture was stirred at room temperature for 2 hours. The reaction mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution. The organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (4:1→1:1) as the eluant to afford (3R)-3-t-butyldiphenylsilyloxy-1-(4-ethoxycarbonyl-1,3-thiazol-2-yl)pyrrolidine (5.85 g, yield 90%) as a pale brown solid.

Workup

  1. stirringthe resulting mixture was stirred at room temperature overnight
  2. additionwas added to the reaction mixture in an ice bath
  3. stirringthe resulting mixture was stirred at room temperature for 2 hours
  4. customThe reaction mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution
  5. washThe organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution
  6. dry with materialdried over anhydrous sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure
  9. customThe residue was purified by chromatography on a silica gel column

Sources & evidence

ORD record
ord-4cd66f233936459988d4ae5a7332649f
Source dataset
uspto-grants-2006_02
Patent number
US07001897B2

Reaction notes

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